18 Chapter 4 Troubleshooting
NetSure 731 A91 Subrack Power System User Manual
Figure 4-4 Installing Rectifier
4.2.1 Rectifier Fan Replacement
Each Rectifier uses a fan (P/N:32010485) for cooling. If fan replacement should become necessary, perform the
following procedure.
Refer to Figure 4-4 as this procedure is performed.
WARNING!
In a system with NO redundant Rectifier, battery must have sufficient reserve to power the load(s) while the Rectifier is removed
for fan replacement.
Note:
When performing any step in this procedure that requires removal of existing hardware, retain all hardware for use in subsequent
steps.
Procedure
1. Performing this procedure may activate external alarms. Do one of the following. If possible, disable these alarms.
If these alarms cannot be easily disabled, notify the appropriate personnel to disregard any alarms associated with
this system while this procedure is performed.
2. Remove the Rectifier from the shelf. Refer to a previous procedure for step-by-step instructions.
3. On this Rectifier; remove the front panel by removing the screws securing the front panel to the chassis, and by
unplugging the fan from the printed circuit card.
4. For proper orientation of the new fan, observe the location of the fan wires and the air flow arrows on the old fan.
5. Remove the old fan from the front panel by removing the two screws and clips securing the fan.
6. Install the new fan onto the front panel using the two screws and clips previously removed. Ensure the fan wires
and air flow arrows match the orientation of the old fan.
7. Install the front panel with the new fan onto the chassis by plugging the fan cable into the printed circuit card, and
securing the front panel with the screws previously removed.
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